diff --git a/10_fibonacci/fibonacci.js b/10_fibonacci/fibonacci.js
index fb278ac..38f2021 100644
--- a/10_fibonacci/fibonacci.js
+++ b/10_fibonacci/fibonacci.js
@@ -1,6 +1,7 @@
-const fibonacci = function(number, b) {
-    let sum;
-    for (let i = 0, a = 1, b = 1;
+const fibonacci = function(number) {
+    let a = 1, b = 1;
+    let sum = a;
+    for (let i = 0;
          i < number - 2;
          i++, (i % 2 == 0) ? a = sum : b = sum) {
         sum = a + b;
diff --git a/10_fibonacci/fibonacci.spec.js b/10_fibonacci/fibonacci.spec.js
index caedfdf..6601caf 100644
--- a/10_fibonacci/fibonacci.spec.js
+++ b/10_fibonacci/fibonacci.spec.js
@@ -16,6 +16,12 @@ describe('fibonacci', () => {
   test('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
+  test('1st fibonacci number is 1', () => {
+    expect(fibonacci(1)).toBe(1);
+  });
+  test('2nd fibonacci number is 1', () => {
+    expect(fibonacci(2)).toBe(1);
+  });
   test.skip('0th fibonacci number is 0', () => {
     expect(fibonacci(0)).toBe(0);
   });